Means securing a deflection yoke to the neck of a cathode ray teche

ABSTRACT

A deflection yoke having hook members which retains a clamp band from outside and is projected from the rear face of the flanged part provided at the tapered smaller end portion of a horn type bobbin.

[111 3,761,848 [4 1 Sept. 25, 1973 United States Patent [1 1 Sngiura [56] References Cited UNITED STATES PATENTS MEANS SECURING A DEFLECTION YOKE TO THE NECK OF A CATHODE RAY TECHE [75] Inventor: Katsuyoshi Sugiura, Yokohama, 2,840,740 6/1958 Bickford......................... 335/212 X Kanagawa, Japan 3,469,218

9/1969 Zoladz..........

335/210 3/1970 Anthony...........................

[73] Assignee: Denki Onkyo Co., Ltd., Tokyo,

Japan Primary ExaminerGeorge Harris [22] Filed: Jan. 2, 1973 Attorney-James E. Armstrong et al.

[57] ABSTRACT A deflection yoke having hook members which retains [2]} Appl. No.: 320,478

a clamp band from outside and is projected from the rear face of the flanged part provided at the tapered smaller end portion of a horn type bobbin.

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Patented Sept. 25, 1973 3,761,848

3 SheetsSheet 2 FIGA 23 .2

FIGS

Patented Sept. 25, 1973 3,761,848

3 Sheets-Sheet i.

FIGB

MEANS SECURING A DEFLECTION YOKE TO THE NECK OF A CATHODE RAY TECIIE BACKGROUND OF THE INVENTION The present invention relates to a deflection yoke which is mounted on the neck part of the cathode ray tube of a television picture tube.

Generally, this type of deflection yoke, as shown in FIG. 6, is constructed so that segmental pieces 103 projected from flanged part 102 formed behind bobbin 101 is mounted on neck part 105a of the cathode ray tube by clamp band 104.

Accordingly,.clamp band 104 is mounted in advance on the deflection yoke when it is manufactured. The conventional clamp bands often come off the segmental pieces due to vibration during packing or transportation or due to contact or vibration during assembly of television receiver sets. Therefore, the working efficiency may deteriorate. Conventionally, projection l03r1is formed at the end of segmental piece 103 as a mean to prevent the clamp band" from coming off as shown. It is impossible for this means to completely prevent comi'ngoff of the clamp band from the deflection yoke.

The present invention provides a deflection yoke designed toprevent the clamp band from coming off.

SUMMARY A deflection yoke comprising a bobbin which is formed in the shape of horn; provided with a-through hole in the axial direction and has a tapered smaller end portion, vertical and horizontal deflection coils which are mounted on said bobbin, a flanged part which is provided at saidtaperedsmallerend portion and has a rear face at a right angle to the axial direction of said bobbin, a plurality of segmental pieces which are projected from said rear face in said axial direction so that the segmental piecessurround said through hole, a clamp band which surrounds and retains said segmental pieces and hook members which are projected from rear face, located outside said clamp band and formed in the shape of hook so that the end portions of hook members areprojected toward said through hole,

wherein the end portions of said hook members hold' said clamp band at the edge.

BRIEF DESCRIPTION OF DRAWINGS The present invention is illustrated in detail by the accompanying drawings.

' the present invention,

FIG. 5 is a cross sectional front view'of another embodiment of the deflection yoke in accordance with the present invention, and

FIG. 6 is a front view of a conventional deflection yoke.

DETAILED DESCRIPTION OF THE INVENTION Referring to FIG. 1, there is shown a deflection yoke according to the present invention.

Bobbin 1 is made of an insulating material in the form of horn and is provided with through hole la in the axial direction.

Flanged part 2 formed integral with said bobbin is provided at tapered smaller end portion lb.

Said flanged part 2 is comprised of front face 21 and rear face 22 respectively having a plane positioned at a right angle to the axial direction of bobbin la and a peripheral annular surface 23 which surrounds said faces, thus forming annular space V leading to through hole 1a.

A plurality of segmental pieces 3 projected from rear face 22 are arranged so as to surround through hole 1a,

Slots 4 between the segmental pieces are provided with hook members 5. Basic portions 51 of said hook members leading to rear face 22 are arranged so that the distance between the center axis of bobbin 1 and basic portions 51 is slightly larger than the distance between segmental pieces 3 and said center axis and extreme end portions 52 are formed to be bent toward said center axis. r

Annular clamp band 8 made of a metal or other material is provided between said hook members and segmental pieces 3. Clamp band 8 surrounds segmental pieces 3 and the end part of clamp band 8 is hooked at extreme endportions 52 of hook members 5.

When the deflection yoke is fixed to the neck portion of the cathode ray tube, segmental pieces 3 are clamped to said neck portion by tightening said clamp band withthe other means so that the diameter of the clamp band becomes smaller.

Extreme end portions 52 of said hook members are preferred to be" made with resilience oriented toward the center axis of bobbin 1 so that they are kept close to said center axis rather than basic portions 51 when clamp band 8 is not mounted as shown in FIG. 2.

Accordingly, clamp band 8 is depressed by hook members 5 from outside and therefore it is effectively clamped.

A plurality of small projections G'projected from rear face 22 of flanged part 2 are located outside segmental pieces 3. These small projections are provided to retain the centering magnet. Since the projections are not provided at segmental pieces 3 different from the conventional type deflection yoke, the centering magnet has nothing to do with deformation of the segmental pieces when the clamp band is tightened and is accordingly retained in a stable condition at all times.

Bobbin l is mounted with horizontal deflection coil 7 and vertical deflection coil 7 Horizontal deflection coil 7 is wound in the form of saddle and mounted at the internal periphery of bobbin 1 while vertical deflection coil 7' is toroidally wound on annular magnetic core'9 and is mounted on the external periphery of I bobbin 1. 1

The end part of horizontal deflection coil 7 at the side of flanged part 2 is bent outwardly and is inserted into space V in flanged part 2.

Said both deflection coils can be wound in the saddle shape, or the horizontal deflection coil is toroidally wound and the vertical deflection coil can be wound in the saddle shape.

The deflection yoke in accordance with the present invention is as described above. It can be constructed as described below.

Referring to FIG. 4, there is shown a deflection yoke provided with extending pieces 53 projected outwardly at extreme end portions 52 of hook members 5.

Extending pieces 53 are preferred to be made as if the bent portions 52a of extreme end portions 52 are outwardly extended as shown in the figure.

In case of the said construction, the extending pieces can be depressed or pulled by external force to bend hook pieces 5 when mounting or dismounting clamp band 8 from segmental pieces 3. Accordingly, the work efficiency is improved.

Referring to FIG. 5, there is shown a construction in which rear face 22 and peripheral portion 23 of flanged part 2 are made separately from bobbin 1.

Front face 21 of flanged part 2 is made integral with tapered smaller end portion lb and peripheral portion 23 integral with rear face 22 is fitted on the periphery of front face 21.

As described above, the deflection yoke in accordance with the present invention is constructed so that the clamp band is retained by said hook members. Accordingly, the clamp band can be effectively prevented from dropping off from the segmental pieces during packing of the deflection yokes in carton boxes, transportation or assembly work of television receiver sets. Thus, the work efficiency can be vastly improved.

Since the clamp band is held from the outside, it can be stably retained regardless of deformation of the segmental pieces, which occurs after forming, due to una. a bobbin which is formed in a horn shape, is provided with a through hole in the axial direction and has a tapered smaller end portion,

b. a pair of deflection coils mounted on said bobbin,

c. a flanged part which is provided at the tapered smaller end portion of said bobbin and has a rear face at a right angle to the axial direction of said bobbin,

d. a plurality of segmental pieces which are projected to surround said through hole,

e. a clamp band which surrounds said segmental pieces, and

f. hook members which are projected from said rear face, are located at the external periphery of said clamp band and are formed in the shape of hook with extreme end portions projected in the direction toward said through hole,

wherein the extreme end portions of said hook members retain the clamp band.

2. A deflection yoke according to claim 1, wherein said flanged part is made integral with said bobbin.

3. A deflection yoke according to claim 1, wherein said flanged part is formed separately from said bobbin.

4. A deflection yoke according to claim 1, wherein extending pieces projected outwardly opposite to said through hole are provided at said extreme end portions.

5. A deflection yoke according to claim 1, wherein said hook members are made so as to provide a resileven pressure when the segmental pieces are formed. ience oriented toward the direction where said clamp band is tightened from outside. 

1. A deflection yoke comprising a. a bobbin which is formed in a horn shape, is provided with a through hole in the axial direction and has a tapered smaller end portion, b. a pair of deflection coils mounted on said bobbin, c. a flanged part which is provided at the tapered smaller end portion of said bobbin and has a rear face at a right angle to the axial direction of said bobbin, d. a plurality of segmental pieces which are projected to surround said through hole, e. a clamp band which surrounds said segmental pieces, and f. hook members which are projected from said rear face, are located at the external periphery of said clamp band and are formed in the shape of hook with extreme end portions projected in the direction toward said through hole, wherein the extreme end portions of said hook members retain the clamp band.
 2. A deflection yoke according to claim 1, wherein said flanged part is made integral with said bobbin.
 3. A deflection yoke according to claim 1, wherein said flanged part is formed separately from said bobbin.
 4. A deflection yoke according to claim 1, wherein extending pieces projected outwardly opposite to said through hole are provided at said extreme end portions.
 5. A deflection yoke according to claim 1, wherein said hook members are made so as to provide a resilience oriented toward the direction where said clamp band is tightened from outside. 